2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/55084It is well-known that the quantum tunneling makes conventional perturbation series non-Borel summable. We use this fact reversely and attempt to extract the decay width of the false-vacuum from the actual perturbation series of the vacuum energy density (vacuum bubble diagrams). It is confirmed that, at least in quantum mechanical examples, our proposal provides a complementary approach to the conventional instanton calculus in the strong coupling region.5 pages, LaTeX with espcrc2 macro. Talk given at the 7th Asia Pacific Physics Conference, August 19--23, 1997, Peking, ChinaHigh Energy Physics - Theorytext